title: P-31 MR spectroscopy of normal human brain and brain tumors.
abstract: Image-guided phosphorus-31 magnetic resonance (MR)-localized image-selected in vivo spectroscopy was performed on normal human brain and brain tumors. Peak area ratios, absolute molar concentrations of metabolites, and pH were determined. T1 values in normal brain were measured. The most important finding was that the metabolite concentrations detectable with MR spectroscopy in brain tumors were reduced from 20% to 70%. Phosphomonoesters, phosphodiesters, and phosphocreatine (PCr) showed the greatest decreases, while inorganic phosphate (Pi) showed the least change. The PCr-Pi ratio was significantly reduced in tumors. The pH of brain tumors (7.12 +/- 0.03) was more alkaline than that of normal brain (6.99 +/- 0.01). The authors conclude that the metabolite concentrations and pH in human brain tumors differ significantly from those in normal brain. These differences may be ultimately useful in characterizing tumors in man.
authors.affiliation: Veterans Administration Medical Center, San Francisco, CA 94121.
authors.forename: B
authors.initials: B
authors.lastname: Hubesch
authors.forename: D
authors.initials: D
authors.lastname: Sappey-Marinier
authors.forename: K
authors.initials: K
authors.lastname: Roth
authors.forename: D J
authors.initials: DJ
authors.lastname: Meyerhoff
authors.forename: G B
authors.initials: GB
authors.lastname: Matson
authors.forename: M W
authors.initials: MW
authors.lastname: Weiner
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000175:diagnosis / Q000378:metabolism; D001921:Brain / Q000033:anatomy & histology* / Q000378:metabolism; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000378:metabolism; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged; D010710:Phosphates / Q000378:metabolism; D010758:Phosphorus; D010767:Phosphorylcholine / Q000378:metabolism
chemical_list: D010710:Phosphates; D010767:Phosphorylcholine; D010758:Phosphorus